I have looked the very good and simple example and tested it successfully (Wiki: Object_Teams_Quick-Start).
Then I wanted to compile the plugin with Tycho and read 2Between the Times" from objectteams blog.

Before I try to reproduce I have a quick guess:
You seem to use Tycho only for binding the OT/J compiler, but your project is not actually a Tycho build because you declare a "jar" packaging.
Please try setting the packaging to s.t. like "eclipse-plugin" (see the Tycho documentation [1]).

Thanks for trying, it reminds me I should write a follow-up blog post describing how to build OT/Equinox bundles with Tycho